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Saturday, August 18, 2012

BARE METAL ENVIRONMENT & HYPERVISORS

1.   I had till now been playing around with Virtual Machines for quiet some time . I started with loading xp on Vista around 2006-7 and then tried networking,played around with basic linux OS....but what I did everi time was that I loaded the host OS first and then allocated the desired resources in form of some RAM and HDD and then booting the new OS....but then I was wasting the host OS Resource that actually is running the various virtual machines on it.....so how to use that, is where Bare Metal Environment comes in to rescue.

2.    Simply told,a bare metal environment is a system in which a virtual machine is installed directly on hardware rather than within the host operating system (OS). The term "bare metal" refers to a hard disk, the usual medium on which a computer's OS is installed.But then how come it is called virtual when the machine is directly running on the hardware? So actually a kind of  a pseudonym since a virtual machine running directly on bare metal would technically not be a virtual machine. In such cases VMs run within a hypervisor which creates the abstraction layer between physical and virtual hardware. So whats Hypervisor?? :-)

3.    A hypervisor is actually the virtual machine manager (VMM), or a virtualization technique allowing multiple operating systems to run concurrently on a host computer. Multiple instances of a variety of operating systems may share the virtualized hardware resources.The hypervisors are classified into basically two types as follows :

Type 1 refers to bare metal hypervisors that run directly on the host's hardware to control the hardware and to manage guest operating systems. 

Type 2 refers to hypervisors that run within a conventional operating system environment. With the hypervisor layer as a distinct second software level, guest operating systems run at the third level above the hardware.This classification can be made more clear with the help of figures below :

TYPE 1 : THE NATIVE BARE METAL TYPE
(click to enlarge)

TYPE 2 : HOSTED TYPE


(click to enlarge)
4.    Thanks Wiki and http://forums.hornfans.com

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